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233, 238, 245, 246, 251, 268, 273 ], "witness_provenance": { "found_by": [ "@vprusso" ], "date": "2026-10-30", "found_at_samples": 300000000, "survived_samples": 300000000, "tool": "verify/ris_gpu.py (Perlmutter A100)", "seeds": [ 1 ] } } }, "provenance": { "authors": [ "@vprusso" ], "construction": "Two-block group-algebra code on the dihedral group D_69 (order 138, n = 276): mul, _ = research/kit/group_algebra.dihedral(69); H_X, H_Z = group_algebra.build_2bga(mul, a=[95, 79, 84, 75], b=[60, 122, 54, 113]), with a and b indices into that element list, H_X = [L(a) | R(b)], H_Z = [R(b)^T | L(a)^T].", "references": [ "H.-K. Lin and L. P. Pryadko, Quantum two-block group algebra codes, Phys. Rev. A 109, 022407 (2024), arXiv:2306.16400" ], "date": "2026-10-24", "notes": "Unattended loop run on Perlmutter, iteration 609, direction dihedral-w4, seed 20261626. The loop gate's 8,000-trial search read d = 30; the deeper rungs recorded in notes/ read 27, and the document carries those witnesses.", "model": "Claude Fable 5.1 (Claude Code) working for @vprusso", "origin": "submission", "search_budget": { "candidates_screened": 33240, "tool": "research/kit/search.screen_adaptive; verify/heuristic_distance.estimate; verify/ris_gpu.py", "notes": "candidates_screened counts direction dihedral-w4 of the loop through 29 October; the loop's 390.6 CPU hours cover all five directions", "gpu_hours": 0.34, "ris_trials_per_side": 300000000 } }, "family": "generalized-bicycle" }